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| author | Laurent Vivier <laurent@vivier.eu> | 2018-04-11 21:23:47 +0200 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2018-05-03 18:29:15 +0200 |
| commit | 465e237bf7cb6a9d8f9f137508125a14efcce1d6 (patch) | |
| tree | 1eaf5f3576d7f080b2a664466582975ae81ae986 /linux-user/riscv | |
| parent | e8fa72957419c11984608062c7dcb204a6003a06 (diff) | |
| download | qemu-465e237bf7cb6a9d8f9f137508125a14efcce1d6.tar.gz | |
linux-user: introduce target_sigsp() and target_save_altstack()
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180411192347.30228-1-laurent@vivier.eu>
Diffstat (limited to 'linux-user/riscv')
| -rw-r--r-- | linux-user/riscv/signal.c | 28 |
1 files changed, 9 insertions, 19 deletions
diff --git a/linux-user/riscv/signal.c b/linux-user/riscv/signal.c index 718f3a5679..ef599e319a 100644 --- a/linux-user/riscv/signal.c +++ b/linux-user/riscv/signal.c @@ -54,24 +54,20 @@ struct target_rt_sigframe { static abi_ulong get_sigframe(struct target_sigaction *ka, CPURISCVState *regs, size_t framesize) { - abi_ulong sp = regs->gpr[xSP]; - int onsigstack = on_sig_stack(sp); - - /* redzone */ - /* This is the X/Open sanctioned signal stack switching. */ - if ((ka->sa_flags & TARGET_SA_ONSTACK) != 0 && !onsigstack) { - sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; - } - - sp -= framesize; - sp &= ~3UL; /* align sp on 4-byte boundary */ + abi_ulong sp = get_sp_from_cpustate(regs); /* If we are on the alternate signal stack and would overflow it, don't. Return an always-bogus address instead so we will die with SIGSEGV. */ - if (onsigstack && !likely(on_sig_stack(sp))) { + if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) { return -1L; } + /* This is the X/Open sanctioned signal stack switching. */ + sp = target_sigsp(sp, ka) - framesize; + + /* XXX: kernel aligns with 0xf ? */ + sp &= ~3UL; /* align sp on 4-byte boundary */ + return sp; } @@ -95,16 +91,10 @@ static void setup_sigcontext(struct target_sigcontext *sc, CPURISCVState *env) static void setup_ucontext(struct target_ucontext *uc, CPURISCVState *env, target_sigset_t *set) { - abi_ulong ss_sp = (target_ulong)target_sigaltstack_used.ss_sp; - abi_ulong ss_flags = sas_ss_flags(env->gpr[xSP]); - abi_ulong ss_size = target_sigaltstack_used.ss_size; - __put_user(0, &(uc->uc_flags)); __put_user(0, &(uc->uc_link)); - __put_user(ss_sp, &(uc->uc_stack.ss_sp)); - __put_user(ss_flags, &(uc->uc_stack.ss_flags)); - __put_user(ss_size, &(uc->uc_stack.ss_size)); + target_save_altstack(&uc->uc_stack, env); int i; for (i = 0; i < TARGET_NSIG_WORDS; i++) { |